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Rifles, Reloading, Optics, Equipment
Reloading
Using chronograph data to determine the best load????
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<blockquote data-quote="RDM416" data-source="post: 93042" data-attributes="member: 3745"><p>Bill,</p><p></p><p>I have been watching the posts with interest about the effect of a light hold versus a firm hold and the impact this would have on velocity. </p><p></p><p>I agree with you that it should have no effect under normal conditions. Normal conditions being a rifle of typical weight, let's say, 8lbs and up. (I am giving my opinion here guys and could be proven wrong) </p><p></p><p>While I don't claim to be a full fledged physicist, I am an electronic engineer with a significant background in phisics both classroom and practical. </p><p></p><p>You are correct about "work" if the gun does not move that means no "work" has been accomplished but it does not mean that no energy has been expended. Energy can be expended in other ways than movement, heat for example. </p><p></p><p>It takes a very short time for a bullet to exit a barrel. A bullet traveling at 3000fps will take .000722 seconds to exit a 26" barrel. /ubbthreads/images/graemlins/blush.gif Due to the mass of the rifle there will have been no significant movement (recoil) at this point. High speed photography will prove this. Also consider that if the movement of the rifle recoiling has an effect on velocity, logicaly that could only be true if the rifle began to move BEFORE the bullet exited the barrel. If that were the case accuracy would impossible to obtain due to the movement of the entire rifle which would very erratic. So, logic as well the previously mentioned photography would suggest that since the bullet has left the barrel before the rifle begins to recoil, that there would be no effect on velocity. </p><p></p><p>That said............we return to the question of mass. There must be enough mass in the form of the rifle to create this effect. For example: if one were to to take a short section of a lightweight barrel and manage to affix a loaded cartridge in it and fire it with nothing to hold it, the barrel section would go one way and the bullet at a signficantly reduced velocity would go the other. This is because the mass of the fixture would not be great enough to hold it in place until the projectile has exited the barrel. </p><p></p><p>It has been too many years since I have tried to work through this kind of physics and I am not motivated enough to go dig out my old books and figure it out. But MY OPIONION is that the mass of a typical rifle is enough to hold it stationary long enough for the bullet to exit the barrel. At this point, recoil is the residual effect of the explosion that propelled the bullet. However, I do not claim to be able to quanitify how much mass is required in the rifle to cause this effect versus the other extreme example I gave above. </p><p></p><p>And I could be totally wrong. /ubbthreads/images/graemlins/crazy.gif I hope someone on this site is a little more up to date on his physics and can help us put the question to rest. </p><p></p><p>Well that should have muddied the water up a little! /ubbthreads/images/graemlins/grin.gif</p></blockquote><p></p>
[QUOTE="RDM416, post: 93042, member: 3745"] Bill, I have been watching the posts with interest about the effect of a light hold versus a firm hold and the impact this would have on velocity. I agree with you that it should have no effect under normal conditions. Normal conditions being a rifle of typical weight, let's say, 8lbs and up. (I am giving my opinion here guys and could be proven wrong) While I don't claim to be a full fledged physicist, I am an electronic engineer with a significant background in phisics both classroom and practical. You are correct about "work" if the gun does not move that means no "work" has been accomplished but it does not mean that no energy has been expended. Energy can be expended in other ways than movement, heat for example. It takes a very short time for a bullet to exit a barrel. A bullet traveling at 3000fps will take .000722 seconds to exit a 26" barrel. [img]/ubbthreads/images/graemlins/blush.gif[/img] Due to the mass of the rifle there will have been no significant movement (recoil) at this point. High speed photography will prove this. Also consider that if the movement of the rifle recoiling has an effect on velocity, logicaly that could only be true if the rifle began to move BEFORE the bullet exited the barrel. If that were the case accuracy would impossible to obtain due to the movement of the entire rifle which would very erratic. So, logic as well the previously mentioned photography would suggest that since the bullet has left the barrel before the rifle begins to recoil, that there would be no effect on velocity. That said............we return to the question of mass. There must be enough mass in the form of the rifle to create this effect. For example: if one were to to take a short section of a lightweight barrel and manage to affix a loaded cartridge in it and fire it with nothing to hold it, the barrel section would go one way and the bullet at a signficantly reduced velocity would go the other. This is because the mass of the fixture would not be great enough to hold it in place until the projectile has exited the barrel. It has been too many years since I have tried to work through this kind of physics and I am not motivated enough to go dig out my old books and figure it out. But MY OPIONION is that the mass of a typical rifle is enough to hold it stationary long enough for the bullet to exit the barrel. At this point, recoil is the residual effect of the explosion that propelled the bullet. However, I do not claim to be able to quanitify how much mass is required in the rifle to cause this effect versus the other extreme example I gave above. And I could be totally wrong. [img]/ubbthreads/images/graemlins/crazy.gif[/img] I hope someone on this site is a little more up to date on his physics and can help us put the question to rest. Well that should have muddied the water up a little! [img]/ubbthreads/images/graemlins/grin.gif[/img] [/QUOTE]
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Using chronograph data to determine the best load????
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